ByGames has Heavy Crossbow (iTunes Link) in the iTunes App Store for FREE for a limited time. That’s a buck off for this challenge game.

Viderea Inc. has X Invasion (iTunes Link) in the iTunes App Store for FREE for a limited time.

X Invasion’s realistic free roaming 3D technology means you are free to decide how your adventure unfolds. Blasting everything in sight is great stress relief! Or test your accuracy as a sniper. Or simply enjoy a relaxing flight over the beautiful San Francisco Bay Area and test your pilot skills as you experience a realistic flight simulation. It includes two modes of play: Career Mode and Timed Mode. In Career Mode, accumulate medals of honor through multi-level play as you progress in experience all the way to the prestigious Top Gun ranking. In Timed Mode, blast your way to infamy on X Invasion’s real-time high score.

Vincent Nguyen has Udder Chaos (iTunes Link) in the iTunes App Store for FREE for a limited time.

Udder Choas is an alien shooter where you have to protect your cows from Alien hordes as they try to abduct your precious livestock. If Alien hordes too hard, upgrade your weapons and gain smart bombs to blow them out of the sky.

BITWEEN S.R.L is offering Warp Fighter (iTunes Link) in the iTunes App Store for FREE for a limited time. Deal expires October 29. 2009.

Warp Fighter is a aerial dog fight game through time in different ages from first world war 1 until a futuristic UFO to fight air to air with them.
In the 3rd century of the earth’s life the human became a confederation and the industry pollution was the major problem , this caused a collapsing of the entire temperature system that create holes on the ozone , the solar shadow make a chain reaction that create an overlapping of ages between the old and the new worlds.

Old and new country start to be face to face with different cultures and war concept was never forgiven , so each country of this different parallel world decide to race against each other creating the warp fighter challenge.

Scope of the challenging is to beat all the other airplanes and survive to this one to many air combat game
This game is dedicated to enthusiasts of ’80 shoot’em up game is a remix of the old time pilot game with a new completely renovated sound and graphics plus more weapons for a full nice extended game.